package com.hmdp.controller.utils;

import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
// 秒杀业务
public class RedisIdWorker {
    @Resource
    private RedisTemplate redisTemplate;
    private static final long BEGIN_TIMESTAMP = 1739145600L;
    private static final int COUNT_BITS = 32;

    public long nextId(String keyPrefix){
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long second = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = second - BEGIN_TIMESTAMP;
        // 2.生成序列号
        //2.1 获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2 自增长
        long count = redisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        // 3.拼接并返回
        return timestamp << COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2025,2,10,0,0,0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("Second = " + second);
    }


}

